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An instructor believes that 20% or less of the students who finish a statistics course gat an "A" grade. A sample of 100 students was taken. 24 of the students in the sample received an "A". Test the instructor's claim at a 5% level of significance. What is your conclusion?
Assume that the population of heights of treated plants is normally distributed with mean. Based on the sample, can it be concluded that is different from centimeters? Use the level of significance. Perform a two-tailed test. Then fill in the table..
Quality Progress, Feburary 2005, reports on the results achieved by Bank of America in improving customer satisfaction and customer loyalty by listening to the "voice of the customer".
Is there evidence that the change was successful in reducing the wait time? (use 0.05 level of significance)
Use Hypothesis testing to compute te correlation between these two variables and these it for significance. Test at .01 level of significance.
If we reandomly select 5 ball with replacement, what is the probability distribution of x-the number of red balls in the sample?
A sample of 500 respondents in a large metropolitan area was selected to study consumer behavior. Among the questions asked was "do you enjoy shopping for clothing?" Of 240 males, 136 answered yes.
As part of its testing program, LongLast tests a sample of 25 batteries. What is the standard error of the mean?
Generate a scatterplot for Occupancy Rate (Y) vs. Rent per Sq. Ft. (X). Send this graph to me via email. State the equation of the best fit line. State and interpret the values of bo and b1.
Explain your answer to someone who is familiar with the T test for a single sample, but not with the T test independent means.
Two mating parts have critical dimensions x1 and x2 as shown below. Assume that x1 and x2 are normally distributed with means 1 and mean2 and standard deviations s1 = 0.400 and s2 = 0.300.
What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval?
People assigned to assemble circuit boards for a computer manufacturing company under go on the job training. From past experience it was found that the learning curve for the average employee is given by:
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